Arcade Collecting > Restorations & repair
GORF!!!!
dmel75:
--- Quote from: RayB on June 08, 2009, 10:14:15 am ---
--- Quote from: dmel75 on June 08, 2009, 09:41:02 am ---Just for kicks, what is the proper voltage I need to be looking for? I've used a voltmeter but it's been a LOOOOOONG time ago and it was just for battery checking for RC cars. ;)
--- End quote ---
Dude, LOOK at the photos.
--- End quote ---
*SMACKS HEAD - HARD*
So, just connect the DMM to the 5v and GRND and look for 5v on the DMM right?
Sorry, pretty new to this part of arcade stuff.
SirPeale:
:D
You're not looking for spot-on numbers - they'll almost never happen. What you're looking for is acceptable ones. If your +5VDC is reading 5.18 volts, that's /quite/ acceptable. If it's only reading +3.4VDC, that is NOT.
And whereas you can check the voltage on the power supply as a first step, you should always measure your voltages on the board itself.
You'll always lose some in the harness and in the connections, that's to be expected. How MUCH you lose is a matter of course. If you read +5.2VDC on the power supply, and +5.1VDC on the board, that's acceptable loss. If you read +5.2VDC on the power supply and only 4.7VDC on the board, start looking for why there's that huge drop. Broken solder joints, oxidized connections, burnt headers - all reasons why that can happen.
The most valuable tool that you have in your disposal (besides your meter) is your eyes. Keep them open.
dmel75:
I put the DMM on the PCB cage and got 5.14v in the places I expected to see it. I guess I need to start working up the chain now. Symptoms are still the same: Powers on, total red screen, no activity or sound, occasionally (1 out of 10 or so) on a power up I'll see some Gorf play but hear no sound.
SirPeale:
Other things to try is to reseat any socketed chips on the board. Press down lightly on them. If you hear them crunch a little bit, they've come out of their socket a bit. Do that for all of them. Failing that you may need to pop them out slightly and reseat them.
Use a jewelers screwdriver to pop the chip out at both ends. Do it SLOWLY. Do it GENTLY. I wouldn't pop it out all the way, just about 1/2 way, then push it back in.
RayB:
Don't do that with the power on.
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